"One of the most important features of style sheets is that they specify how a document is to be presented on different media: on the screen, on paper, with a speech synthesizer, with a braille device, etc." Recognized media types: all, braille, embossed, handheld, print, projection, screen, speech, tty, tv Media Groups: continuous/paged, visual/audio/speech/tactile, grid/bitmap, interactive/static